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Gurum Ahmad Pauzi
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INDONESIA
Journal of Energy, Material, and Instrumentation Technology
Published by Universitas Lampung
ISSN : 27472043     EISSN : 2747299X     DOI : https://doi.org/10.23960/jemit
Core Subject : Science, Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Ruang lingkup penulisan dalam jurnal ini meliputi: 1. Fisika Teori Mekanika Klasik Elektromagnetik Termodinamika Mekanika Statistik Mekanika Kuantum Teori Relativitas Kuantum Gravitasi Astrofisika Kosmologi 2. Fisika Bumi (Geofisika) Geothermal Geolistrik Seismik Geomagnet 3. Fisika Material Nanomaterial Logam dan Korosi Material Magnetik Thin Film Fotokatalis/Katalis Semikonduktor Superkonduktor Keramik Polimer 4. Elektronika dan Instrumentasi Sensor Instrumentasi Biomedik Instrumentasi Pertanian Instrumentasi Lingkungan Biofisika Fisika Komputasi Laser 5. Fisika Nuklir Keselamatan Reaktor Analisis Neutronik Manajemen Bahan Bakar dan Limbah
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 121 Documents
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The Effect of NaOH on the Synthesis of Nano ZnO Using Red Betel Leaves (Piper crocatum) by Green Synthesis Method Nurcahayaniati, Hikmah; Manurung, Posman; Suciyati, Sri Wahyu; Asmi, Dwi
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.227

Abstract

ZnO has been produced using a green synthesis method. This research aims to determine the effect of  NaOH variations on ZnO nanoparticles obtained using red betel leaf extract. The variation of  NaOH used is 0,2; 0,4; 0,6;  the characterization carried out was Fourier Transformation Infra Red (FTIR), X-Ray Difraction (XRD),   Scanning Electron  Microscopy (SEM), dan Ultra Violet Vissible (UV DRS) the results of FTIR  characterization show that the functional groups in red betel leaves play a role in the information of  ZnO nanoparticles, XRD characrerization shows diffraction peaks of ZnO nanoparticles and the presence of NaNO3 phase at 0,2; 0,4; 0,6; and 1 M variation. Then, the SEM results showed a spherical morphology at a 1 M variation, and the UV-DRS results showed an absorption peak at 331 nm and a band gap energy of 3.11 eV.
Analysis of Aluminium Alloy 6061 Material Coating with the Addition of Malonic Acid Additive in the Plasma Electrolytic Oxidation Method to Improve Corrosion Resistance Properties Lubis, Muhammad Ihsan; Mutmainnah; Kamil, Muhammad Prisla; Suwondo, Kusuma Putri; Asriyani, Nur; Lantang, Jessica Valenthine
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.335

Abstract

Aluminum alloy 6061 is extensively used in structural and engineering applications due to its favorable strength-to-weight ratio, good mechanical properties, and inherent corrosion resistance. However, it remains vulnerable to localized corrosion, especially in chloride-rich environments. This study investigates the effect of malonic acid (MA) as an organic additive in the Plasma Electrolytic Oxidation (PEO) process to enhance the corrosion resistance of aluminum alloy 6061. The experimental results indicate that the presence of MA reduces plasma initiation time, stabilizes discharge behavior, and facilitates the formation of a denser and more uniform oxide layer. Surface morphology analysis reveals that PEO coatings with MA exhibit finer porosity and a thicker structure, contributing to improved barrier properties. XRD characterization confirms the presence of stable crystalline phases such as mullite and andalusite in the MA-enhanced coatings. Electrochemical testing via Tafel polarization shows a significant reduction in corrosion current density (3.899 x 10-7 A/cm2) and corrosion rate (0.642 mm/year), alongside a more positive corrosion potential (-2.616 V) in the MA-treated samples. When compared to traditional corrosion inhibitors, both organic (for example, imidazole-based compounds) and inorganic (for example, CaCO3 and SiO2), the PEO plus MA method demonstrates superior long-term corrosion resistance and structural stability. These findings highlight the potential of malonic acid as an effective additive for optimizing the PEO process in demanding environmental conditions.
Effect of Layer Deposition and Thermal Treatment on the Structural, Optical, and Electrical Characteristics of Spin-Coated CaTiO3 Thin Films Yusron, Darojat; Mustafida, Aulia; Abdul, Rajak; Indra, Pardede
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.339

Abstract

This study investigates the effect of coating repetition and annealing temperature on the structural, optical, and electrical characteristics of calcium titanate (CaTiO3) thin films synthesized via a sol-gel spin coating method. The number of coatings (2, 4, 6, and 8 layers) and annealing temperatures (250 C, 350 C, and 450 C) were varied to optimize the characteristics. X-ray diffraction analysis indicated an improvement in crystallinity with increasing annealing temperature, as evident from the growing diffraction peaks. UV-Vis spectroscopy revealed a decrease in the optical band gap from 3.741 eV to 3.554 eV with increasing coating layers and thermal treatment, suggesting enhanced optical absorption. Current-voltage measurements using a two-point probe method generally showed linear conduction, indicative of ohmic behavior, with one sample exhibiting a mild nonlinear response at higher bias. The results confirm that process parameters significantly influence the functional properties of CaTiO3 thin films. This fundamental study provides a foundation for employing CaTiO3 as a functional layer in perovskite-based photovoltaic devices, paving the way for further device integration and optimization.
Development of a Portable Low-Cost Multispectral Sensor Integrated with IoT and Machine Learning for Classifying Honey Types Muhammad, Riki; Isroni; wisesa, Tri Pujian; Syahputra, Tri Siswandi
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.343

Abstract

Accurate honey type authentication is a significant challenge for small-scale producers, as conventional methods are often costly and impractical. This study aims to design and develop a low-cost honey classification prototype by integrating the AS7265X multispectral sensor with Internet of Things (IoT) technology and machine learning. Spectral data from 18 channels of various Indonesian honey types were acquired using the AS7265X sensor and analyzed exploratively using Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA). The data were then normalized and used to train Artificial Neural Network (ANN), Random Forest (RF), and Support Vector Machine (SVM) classification models. An ESP32-based IoT system was developed for real-time monitoring and cloud data storage. The results demonstrate that AS7265X spectral data effectively differentiate honey types, with the ANN model achieving 94.05% accuracy, supported by a responsive IoT system (1–2 seconds) for monitoring and centralized storage. This prototype shows potential as a practical, rapid, accurate, and efficient honey authentication solution for various stakeholders.
Sustainable Lithium Battery Development in Indonesia: The Role of Natural Materials and Recycling Processes in Future Challenges Latif, Chaironi; Yogianto, Mohammad Fahmi Ilmi; Hafidz, Isa; Adziimaa, Ahmad Fauzan
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.347

Abstract

The development of sustainable lithium-ion batteries is essential to meet the global demand for efficient, high-capacity, and environmentally friendly energy storage systems. This study reviews recent advancements in lithium battery technologies in Indonesia, emphasizing the utilization and performance of locally available natural materials. Among various lithium-ion battery types, those based on Lithium Nickel Manganese Cobalt Oxide (NMC) and Lithium Iron Phosphate (LFP) are considered the most promising for Indonesia due to the availability of key raw materials such as nickel, cobalt, and iron. Additionally, various battery recycling techniques—including pyrometallurgy, hydrometallurgy, bio-hydrometallurgy, and direct recycling methods—are systematically analyzed for their effectiveness in material recovery and environmental impact mitigation. The findings highlight the need for integrated strategies that combine local material utilization, innovation in battery materials and recycling technologies, environmental stewardship, and supportive regulatory frameworks to accelerate the development of a sustainable lithium-ion battery ecosystem in Indonesia.
Enhancing BLDC Motor Performance with Wheel-Hub Design by Modify Coil Configurations Putranto, Rifki Dwi; Hafidz, Isa; Kholima, Henko; Putri, Nur Wahyuni
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 3 (2025): Journal of Energy, Material, and Instrumentation Technology
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.359

Abstract

This paper presents an analysis of the design method of a BLDC (Brushless DC) motor with a wheel-hub structure. This study examines how variations in winding configuration affect motor performance. A 650W wheel-hub BLDC motor will be tested by modifying its stator design, including variations in the number of wires, the number of parallel circuits, and the diameter of its conductor. The test focuses on the effect of these changes on the torque, efficiency, output power and rotational speed of the motor.The test was carried out using standard sized wires. The results show that appropriate winding arrangements can increase motor torque and speed. When the parallel circuit configuration is used, the motor efficiency increases and the wire diameter is optimized. Based on the design implementation carried out, the 650W hub-type BLDC motor tested was able to achieve a maximum power of 956W, a maximum speed of 477 rpm, and a maximum torque of 41 Nm. In addition, the highest efficiency achieved was 86% at a torque of 31.8 Nm, a speed of 239 rpm, and a power of 956W.The results of this study emphasize the importance of proper winding configuration in optimizing motor performance. This winding configuration selection procedure is expected to be a reference in the manufacture of wheel-hub BLDC motors.
Aluminium 6061 is well known for its good tensile strength and high corrosion resistance due to the natural protective oxide layer formed on its surface. However, the phenomenon of corrosion can still occur, particularly in aggressive environments, leadin Nur, Nur Asriyani
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 4 (2025): Journal of Energy, Material, and Instrumentation Technology (In Press)
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Aluminium 6061 is well known for its good tensile strength and high corrosion resistance due to the natural protective oxide layer formed on its surface. However, the phenomenon of corrosion can still occur, particularly in aggressive environments, leading to material degradation. To further enhance corrosion resistance, a coating using the Plasma Electrolytic Oxidation (PEO) method with a concentrated solution of Na2SiO3, KOH, and EDTA was applied for 4 minutes. The addition of EDTA plays a crucial role not only in improving corrosion resistance but also in influencing the dielectric properties of the material, which subsequently affects the absorption of electromagnetic waves. Corrosion testing using the Tafel Polarization method revealed that the PEO coating with EDTA resulted in a more positive corrosion potential and a lower current density compared to untreated Aluminium 6061. Furthermore, EDTA enhances the porosity of the oxide layer, promoting the formation of micro-pores on the surface, which can trap corrosive agents and mitigate corrosion phenomena. Testing with a Vector Network Analyzer (VNA) at frequencies ranging from 8 GHz to 12 GHz demonstrated that the material exhibits an electromagnetic wave absorption of -1 dB. Overall, the application of PEO coating with EDTA significantly improves both corrosion resistance and electromagnetic wave absorption, making it suitable for various applications in the automotive, electronics, and energy industries
Morphological Study of Electrospun Polyvinylpyrrolidone Fibers at High Concentration Using Water and Ethanol Solvents Nugroho, Doni Bowo; Kamal, Nada Nadzira Ayasha; Sidabalok, Jenni Bunga Enjelita; Wati, Rosita; Resfita, Nova; Gifari, Muhammad Wildan
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 4 (2025): Journal of Energy, Material, and Instrumentation Technology (In Press)
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Polyvinylpyrrolidone (PVP) is widely used in biomedical applications, and electrospinning is a common method for fabricating PVP nanofibers. While most studies focus on low to moderate concentrations (5–12 wt%), this work investigates the electrospinning of high-concentration PVP solutions, 50% (m/v), using distilled water and ethanol under applied voltages of 8 and 12 kV. Fiber morphology was characterized by scanning electron microscopy (SEM) and diameter distributions analyzed with ImageJ. Results showed that water-based solutions produced discontinuous fibers with ribbons, beads, and film-like structures, while ethanol-based solutions formed irregular fiber networks at 8 kV but transformed into globular particles at 12 kV due to jet instability. Diameter distribution of water-based fibers was broader (0.31–1.83 µm), whereas ethanol-based fibers exhibited a narrower but larger range (1.29–3.54 µm). These findings indicate that excessive polymer concentration leads to unstable structures, contrasting with continuous fibers reported at lower concentrations. The study highlights the limitations of electrospinning PVP at high concentrations and suggests potential applications in porous films and drug-release systems rather than uniform nanofibers.
Fabrication of Bioceramic Carbonated Hydroxyapatite–Chitosan Composite Scaffold Derived from River Snail Shells via Freeze-Drying for Bone Grafting Applications Wati, Rosita; Alnovera, Vayza Deva; Herbanu, Aldi; Endah; Tresnaningtyas, Sekar Asri; Gifari, Muhammad Wildan; Siburian, Marsudi
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 4 (2025): Journal of Energy, Material, and Instrumentation Technology (In Press)
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Exponential-Offset Modelling and XRD Correlation of SOH Degradation in LiFePO4 Batteries under Extreme Loading Latif, Chaironi; Maulana, Tubagus Adam Jody; Yogianto, Mohammad Fahmi Ilmi; Adziimaa, Ahmad Fauzan
Journal of Energy, Material, and Instrumentation Technology Vol 6 No 4 (2025): Journal of Energy, Material, and Instrumentation Technology (In Press)
Publisher : Departement of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jemit.379

Abstract

Understanding the relationship between electrochemical degradation and structural changes is critical for improving the reliability of lithium-ion batteries. In this study, the state of health (SOH) of 18650-type lithium iron phosphate (LiFePO4, LFP) cells was evaluated under extreme loading using discharge resistances of 2.5 Ω and 0.005 Ω. The SOH decreased sharply after the first cycle and then declined more gradually, and the degradation trend was well described by an exponential-offset model with RMSE = 2.87, MAE = 2.25, and R2 = 0.90. Structural analysis was performed by X-ray diffraction (XRD) on electrode samples taken after one discharge at 2.5 Ω (L1), 100 discharges at 2.5 Ω (L100), and one discharge at 0.005 Ω (LD). The XRD results confirmed that the main phase was graphite, but with reduced peak intensities, peak broadening, and increased background noise, indicating crystallinity loss and partial amorphization. These findings demonstrate that SOH degradation is strongly correlated with the decline in crystallinity, and that extreme loading can trigger significant structural deterioration even within a single discharge.

Page 12 of 13 | Total Record : 121

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